/**

 * jQuery lightBox plugin

 * This jQuery plugin was inspired and based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)

 * and adapted to me for use like a plugin from jQuery.

 * @name jquery-lightbox-0.5.js

 * @author Leandro Vieira Pinho - http://leandrovieira.com

 * @version 0.5

 * @date April 11, 2008

 * @category jQuery plugin

 * @copyright (c) 2008 Leandro Vieira Pinho (leandrovieira.com)

 * @license CC Attribution-No Derivative Works 2.5 Brazil - http://creativecommons.org/licenses/by-nd/2.5/br/deed.en_US

 * @example Visit http://leandrovieira.com/projects/jquery/lightbox/ for more informations about this jQuery plugin

 */



// Offering a Custom Alias suport - More info: http://docs.jquery.com/Plugins/Authoring#Custom_Alias

(function($) {

	/**

	 * $ is an alias to jQuery object

	 *

	 */

	$.fn.lightBox = function(settings) {

		// Settings to configure the jQuery lightBox plugin how you like

		settings = jQuery.extend({

			// Configuration related to overlay

			overlayBgColor: 		'#000',		// (string) Background color to overlay; inform a hexadecimal value like: #RRGGBB. Where RR, GG, and BB are the hexadecimal values for the red, green, and blue values of the color.

			overlayOpacity:			0.8,		// (integer) Opacity value to overlay; inform: 0.X. Where X are number from 0 to 9

			// Configuration related to navigation

			fixedNavigation:		false,		// (boolean) Boolean that informs if the navigation (next and prev button) will be fixed or not in the interface.

			// Configuration related to images

			imageLoading:			'images/lightbox/lightbox-ico-loading.gif',		// (string) Path and the name of the loading icon

			imageBtnPrev:			'images/lightbox/lightbox-btn-prev.gif',			// (string) Path and the name of the prev button image

			imageBtnNext:			'images/lightbox/lightbox-btn-next.gif',			// (string) Path and the name of the next button image

			imageBtnClose:			'images/lightbox/lightbox-btn-close.gif',		// (string) Path and the name of the close btn

			imageBlank:				'images/lightbox/lightbox-blank.gif',			// (string) Path and the name of a blank image (one pixel)

			// Configuration related to container image box

			containerBorderSize:	10,			// (integer) If you adjust the padding in the CSS for the container, #lightbox-container-image-box, you will need to update this value

			containerResizeSpeed:	50,		// (integer) Specify the resize duration of container image. These number are miliseconds. 400 is default.

			// Configuration related to texts in caption. For example: Image 2 of 8. You can alter either "Image" and "of" texts.

			txtImage:				'Ảnh thứ',	// (string) Specify text "Image"

			txtOf:					'trong tổng số',		// (string) Specify text "of"

			// Configuration related to keyboard navigation

			keyToClose:				'c',		// (string) (c = close) Letter to close the jQuery lightBox interface. Beyond this letter, the letter X and the SCAPE key is used to.

			keyToPrev:				'p',		// (string) (p = previous) Letter to show the previous image

			keyToNext:				'n',		// (string) (n = next) Letter to show the next image.

			// Don´t alter these variables in any way

			imageArray:				[],

			activeImage:			0

		},settings);

		// Caching the jQuery object with all elements matched

		var jQueryMatchedObj = this; // This, in this context, refer to jQuery object

		/**

		 * Initializing the plugin calling the start function

		 *

		 * @return boolean false

		 */

		function _initialize() {

			_start(this,jQueryMatchedObj); // This, in this context, refer to object (link) which the user have clicked

			return false; // Avoid the browser following the link

		}

		/**

		 * Start the jQuery lightBox plugin

		 *

		 * @param object objClicked The object (link) whick the user have clicked

		 * @param object jQueryMatchedObj The jQuery object with all elements matched

		 */

		function _start(objClicked,jQueryMatchedObj) {

			// Hime some elements to avoid conflict with overlay in IE. These elements appear above the overlay.

			$('embed, object, select').css({ 'visibility' : 'hidden' });

			// Call the function to create the markup structure; style some elements; assign events in some elements.

			_set_interface();

			// Unset total images in imageArray

			settings.imageArray.length = 0;

			// Unset image active information

			settings.activeImage = 0;

			// We have an image set? Or just an image? Let´s see it.

			if ( jQueryMatchedObj.length == 1 ) {

				settings.imageArray.push(new Array(objClicked.getAttribute('href'),objClicked.getAttribute('title')));

			} else {

				// Add an Array (as many as we have), with href and title atributes, inside the Array that storage the images references		

				for ( var i = 0; i < jQueryMatchedObj.length; i++ ) {

					settings.imageArray.push(new Array(jQueryMatchedObj[i].getAttribute('href'),jQueryMatchedObj[i].getAttribute('title')));

				}

			}

			while ( settings.imageArray[settings.activeImage][0] != objClicked.getAttribute('href') ) {

				settings.activeImage++;

			}

			// Call the function that prepares image exibition

			_set_image_to_view();

		}

		/**

		 * Create the jQuery lightBox plugin interface

		 *

		 * The HTML markup will be like that:

			<div id="jquery-overlay"></div>

			<div id="jquery-lightbox">

				<div id="lightbox-container-image-box">

					<div id="lightbox-container-image">

						<img src="../fotos/XX.jpg" id="lightbox-image">

						<div id="lightbox-nav">

							<a href="#" id="lightbox-nav-btnPrev"></a>

							<a href="#" id="lightbox-nav-btnNext"></a>

						</div>

						<div id="lightbox-loading">

							<a href="#" id="lightbox-loading-link">

								<img src="../images/lightbox-ico-loading.gif">

							</a>

						</div>

					</div>

				</div>

				<div id="lightbox-container-image-data-box">

					<div id="lightbox-container-image-data">

						<div id="lightbox-image-details">

							<span id="lightbox-image-details-caption"></span>

							<span id="lightbox-image-details-currentNumber"></span>

						</div>

						<div id="lightbox-secNav">

							<a href="#" id="lightbox-secNav-btnClose">

								<img src="../images/lightbox-btn-close.gif">

							</a>

						</div>

					</div>

				</div>

			</div>

		 *

		 */

		function _set_interface() {

			// Apply the HTML markup into body tag

			$('body').append('<div id="jquery-overlay"></div><div id="jquery-lightbox"><div id="lightbox-container-image-box"><div id="lightbox-container-image"><img id="lightbox-image"><div style="" id="lightbox-nav"><a href="#" id="lightbox-nav-btnPrev"></a><a href="#" id="lightbox-nav-btnNext"></a></div><div id="lightbox-loading"><a href="#" id="lightbox-loading-link"><img src="' + settings.imageLoading + '"></a></div></div></div><div id="lightbox-container-image-data-box"><div id="lightbox-container-image-data"><div id="lightbox-image-details"><span id="lightbox-image-details-caption"></span><span id="lightbox-image-details-currentNumber"></span></div><div id="lightbox-secNav"><a href="#" id="lightbox-secNav-btnClose"><img src="' + settings.imageBtnClose + '"></a></div></div></div></div>');	

			// Get page sizes

			var arrPageSizes = ___getPageSize();

			// Style overlay and show it

			$('#jquery-overlay').css({

				backgroundColor:	settings.overlayBgColor,

				opacity:			settings.overlayOpacity,

				width:				arrPageSizes[0],

				height:				arrPageSizes[1]

			}).fadeIn();

			// Get page scroll

			var arrPageScroll = ___getPageScroll();

			// Calculate top and left offset for the jquery-lightbox div object and show it

			$('#jquery-lightbox').css({

				top:	arrPageScroll[1] + (arrPageSizes[3] / 10),

				left:	arrPageScroll[0]

			}).show();

			// Assigning click events in elements to close overlay

			$('#jquery-overlay,#jquery-lightbox').click(function() {

				_finish();									

			});

			// Assign the _finish function to lightbox-loading-link and lightbox-secNav-btnClose objects

			$('#lightbox-loading-link,#lightbox-secNav-btnClose').click(function() {

				_finish();

				return false;

			});

			// If window was resized, calculate the new overlay dimensions

			$(window).resize(function() {

				// Get page sizes

				var arrPageSizes = ___getPageSize();

				// Style overlay and show it

				$('#jquery-overlay').css({

					width:		arrPageSizes[0],

					height:		arrPageSizes[1]

				});

				// Get page scroll

				var arrPageScroll = ___getPageScroll();

				// Calculate top and left offset for the jquery-lightbox div object and show it

				$('#jquery-lightbox').css({

					top:	arrPageScroll[1] + (arrPageSizes[3] / 10),

					left:	arrPageScroll[0]

				});

			});

		}

		/**

		 * Prepares image exibition; doing a image´s preloader to calculate it´s size

		 *

		 */

		function _set_image_to_view() { // show the loading

			// Show the loading

			$('#lightbox-loading').show();

			if ( settings.fixedNavigation ) {

				$('#lightbox-image,#lightbox-container-image-data-box,#lightbox-image-details-currentNumber').hide();

			} else {

				// Hide some elements

				$('#lightbox-image,#lightbox-nav,#lightbox-nav-btnPrev,#lightbox-nav-btnNext,#lightbox-container-image-data-box,#lightbox-image-details-currentNumber').hide();

			}

			// Image preload process

			var objImagePreloader = new Image();

			objImagePreloader.onload = function() {

				$('#lightbox-image').attr('src',settings.imageArray[settings.activeImage][0]);

				// Perfomance an effect in the image container resizing it

				_resize_container_image_box(objImagePreloader.width,objImagePreloader.height);

				//	clear onLoad, IE behaves irratically with animated gifs otherwise

				objImagePreloader.onload=function(){};

			};

			objImagePreloader.src = settings.imageArray[settings.activeImage][0];

		};

		/**

		 * Perfomance an effect in the image container resizing it

		 *

		 * @param integer intImageWidth The image´s width that will be showed

		 * @param integer intImageHeight The image´s height that will be showed

		 */

		function _resize_container_image_box(intImageWidth,intImageHeight) {

			// Get current width and height

			var intCurrentWidth = $('#lightbox-container-image-box').width();

			var intCurrentHeight = $('#lightbox-container-image-box').height();

			// Get the width and height of the selected image plus the padding

			var intWidth = (intImageWidth + (settings.containerBorderSize * 2)); // Plus the image´s width and the left and right padding value

			var intHeight = (intImageHeight + (settings.containerBorderSize * 2)); // Plus the image´s height and the left and right padding value

			// Diferences

			var intDiffW = intCurrentWidth - intWidth;

			var intDiffH = intCurrentHeight - intHeight;

			// Perfomance the effect

			$('#lightbox-container-image-box').animate({ width: intWidth, height: intHeight },settings.containerResizeSpeed,function() { _show_image(); });

			if ( ( intDiffW == 0 ) && ( intDiffH == 0 ) ) {

				if ( $.browser.msie ) {

					___pause(250);

				} else {

					___pause(100);	

				}

			} 

			$('#lightbox-container-image-data-box').css({ width: intImageWidth });

			$('#lightbox-nav-btnPrev,#lightbox-nav-btnNext').css({ height: intImageHeight + (settings.containerBorderSize * 2) });

		};

		/**

		 * Show the prepared image

		 *

		 */

		function _show_image() {

			$('#lightbox-loading').hide();

			$('#lightbox-image').fadeIn(function() {

				_show_image_data();

				_set_navigation();

			});

			_preload_neighbor_images();

		};

		/**

		 * Show the image information

		 *

		 */

		function _show_image_data() {

			$('#lightbox-container-image-data-box').slideDown('fast');

			$('#lightbox-image-details-caption').hide();

			if ( settings.imageArray[settings.activeImage][1] ) {

				$('#lightbox-image-details-caption').html(settings.imageArray[settings.activeImage][1]).show();

			}

			// If we have a image set, display 'Image X of X'

			if ( settings.imageArray.length > 1 ) {

				$('#lightbox-image-details-currentNumber').html(settings.txtImage + ' ' + ( settings.activeImage + 1 ) + ' ' + settings.txtOf + ' ' + settings.imageArray.length + ' ảnh').show();

			}		

		}

		/**

		 * Display the button navigations

		 *

		 */

		function _set_navigation() {

			$('#lightbox-nav').show();



			// Instead to define this configuration in CSS file, we define here. And it´s need to IE. Just.

			$('#lightbox-nav-btnPrev,#lightbox-nav-btnNext').css({ 'background' : 'transparent url(' + settings.imageBlank + ') no-repeat' });

			

			// Show the prev button, if not the first image in set

			if ( settings.activeImage != 0 ) {

				if ( settings.fixedNavigation ) {

					$('#lightbox-nav-btnPrev').css({ 'background' : 'url(' + settings.imageBtnPrev + ') left 15% no-repeat' })

						.unbind()

						.bind('click',function() {

							settings.activeImage = settings.activeImage - 1;

							_set_image_to_view();

							return false;

						});

				} else {

					// Show the images button for Next buttons

					$('#lightbox-nav-btnPrev').unbind().hover(function() {

						$(this).css({ 'background' : 'url(' + settings.imageBtnPrev + ') left 15% no-repeat' });

					},function() {

						$(this).css({ 'background' : 'transparent url(' + settings.imageBlank + ') no-repeat' });

					}).show().bind('click',function() {

						settings.activeImage = settings.activeImage - 1;

						_set_image_to_view();

						return false;

					});

				}

			}

			

			// Show the next button, if not the last image in set

			if ( settings.activeImage != ( settings.imageArray.length -1 ) ) {

				if ( settings.fixedNavigation ) {

					$('#lightbox-nav-btnNext').css({ 'background' : 'url(' + settings.imageBtnNext + ') right 15% no-repeat' })

						.unbind()

						.bind('click',function() {

							settings.activeImage = settings.activeImage + 1;

							_set_image_to_view();

							return false;

						});

				} else {

					// Show the images button for Next buttons

					$('#lightbox-nav-btnNext').unbind().hover(function() {

						$(this).css({ 'background' : 'url(' + settings.imageBtnNext + ') right 15% no-repeat' });

					},function() {

						$(this).css({ 'background' : 'transparent url(' + settings.imageBlank + ') no-repeat' });

					}).show().bind('click',function() {

						settings.activeImage = settings.activeImage + 1;

						_set_image_to_view();

						return false;

					});

				}

			}

			// Enable keyboard navigation

			_enable_keyboard_navigation();

		}

		/**

		 * Enable a support to keyboard navigation

		 *

		 */

		function _enable_keyboard_navigation() {

			$(document).keydown(function(objEvent) {

				_keyboard_action(objEvent);

			});

		}

		/**

		 * Disable the support to keyboard navigation

		 *

		 */

		function _disable_keyboard_navigation() {

			$(document).unbind();

		}

		/**

		 * Perform the keyboard actions

		 *

		 */

		function _keyboard_action(objEvent) {

			// To ie

			if ( objEvent == null ) {

				keycode = event.keyCode;

				escapeKey = 27;

			// To Mozilla

			} else {

				keycode = objEvent.keyCode;

				escapeKey = objEvent.DOM_VK_ESCAPE;

			}

			// Get the key in lower case form

			key = String.fromCharCode(keycode).toLowerCase();

			// Verify the keys to close the ligthBox

			if ( ( key == settings.keyToClose ) || ( key == 'x' ) || ( keycode == escapeKey ) ) {

				_finish();

			}

			// Verify the key to show the previous image

			if ( ( key == settings.keyToPrev ) || ( keycode == 37 ) ) {

				// If we´re not showing the first image, call the previous

				if ( settings.activeImage != 0 ) {

					settings.activeImage = settings.activeImage - 1;

					_set_image_to_view();

					_disable_keyboard_navigation();

				}

			}

			// Verify the key to show the next image

			if ( ( key == settings.keyToNext ) || ( keycode == 39 ) ) {

				// If we´re not showing the last image, call the next

				if ( settings.activeImage != ( settings.imageArray.length - 1 ) ) {

					settings.activeImage = settings.activeImage + 1;

					_set_image_to_view();

					_disable_keyboard_navigation();

				}

			}

		}

		/**

		 * Preload prev and next images being showed

		 *

		 */

		function _preload_neighbor_images() {

			if ( (settings.imageArray.length -1) > settings.activeImage ) {

				objNext = new Image();

				objNext.src = settings.imageArray[settings.activeImage + 1][0];

			}

			if ( settings.activeImage > 0 ) {

				objPrev = new Image();

				objPrev.src = settings.imageArray[settings.activeImage -1][0];

			}

		}

		/**

		 * Remove jQuery lightBox plugin HTML markup

		 *

		 */

		function _finish() {

			$('#jquery-lightbox').remove();

			$('#jquery-overlay').fadeOut(function() { $('#jquery-overlay').remove(); });

			// Show some elements to avoid conflict with overlay in IE. These elements appear above the overlay.

			$('embed, object, select').css({ 'visibility' : 'visible' });

		}

		/**

		 / THIRD FUNCTION

		 * getPageSize() by quirksmode.com

		 *

		 * @return Array Return an array with page width, height and window width, height

		 */

		function ___getPageSize() {

			var xScroll, yScroll;

			if (window.innerHeight && window.scrollMaxY) {	

				xScroll = window.innerWidth + window.scrollMaxX;

				yScroll = window.innerHeight + window.scrollMaxY;

			} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac

				xScroll = document.body.scrollWidth;

				yScroll = document.body.scrollHeight;

			} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari

				xScroll = document.body.offsetWidth;

				yScroll = document.body.offsetHeight;

			}

			var windowWidth, windowHeight;

			if (self.innerHeight) {	// all except Explorer

				if(document.documentElement.clientWidth){

					windowWidth = document.documentElement.clientWidth; 

				} else {

					windowWidth = self.innerWidth;

				}

				windowHeight = self.innerHeight;

			} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode

				windowWidth = document.documentElement.clientWidth;

				windowHeight = document.documentElement.clientHeight;

			} else if (document.body) { // other Explorers

				windowWidth = document.body.clientWidth;

				windowHeight = document.body.clientHeight;

			}	

			// for small pages with total height less then height of the viewport

			if(yScroll < windowHeight){

				pageHeight = windowHeight;

			} else { 

				pageHeight = yScroll;

			}

			// for small pages with total width less then width of the viewport

			if(xScroll < windowWidth){	

				pageWidth = xScroll;		

			} else {

				pageWidth = windowWidth;

			}

			arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);

			return arrayPageSize;

		};

		/**

		 / THIRD FUNCTION

		 * getPageScroll() by quirksmode.com

		 *

		 * @return Array Return an array with x,y page scroll values.

		 */

		function ___getPageScroll() {

			var xScroll, yScroll;

			if (self.pageYOffset) {

				yScroll = self.pageYOffset;

				xScroll = self.pageXOffset;

			} else if (document.documentElement && document.documentElement.scrollTop) {	 // Explorer 6 Strict

				yScroll = document.documentElement.scrollTop;

				xScroll = document.documentElement.scrollLeft;

			} else if (document.body) {// all other Explorers

				yScroll = document.body.scrollTop;

				xScroll = document.body.scrollLeft;	

			}

			arrayPageScroll = new Array(xScroll,yScroll);

			return arrayPageScroll;

		};

		 /**

		  * Stop the code execution from a escified time in milisecond

		  *

		  */

		 function ___pause(ms) {

			var date = new Date(); 

			curDate = null;

			do { var curDate = new Date(); }

			while ( curDate - date < ms);

		 };

		// Return the jQuery object for chaining. The unbind method is used to avoid click conflict when the plugin is called more than once

		return this.unbind('click').click(_initialize);

	};

})(jQuery); // Call and execute the function immediately passing the jQuery object